the Aviation Dictionary

amended clearance if ATC issues a clearance that
would cause a pilot to deviate from a rule or regulation.
or in the pilot's opinion, would place the akraft in
jeopardy.
ATC clears - Used to prefix an ATC clearance when it
is relayed to an aircraft by other than an air traffic
controller.
ATC instructions - Directives issued by air traffic
control for the purpose of requiring a pilot to take
specific actions such as "Turn left heading two five
zero," "Go-around," or "Clear the runway."
ATC preferred route notification - URET CCLD
(User Request Evaluation Tool Core Capability
Limited Deployment) notification to the appropriate
controller of the need to determine if an ATC preferred
route needs to be applied, based on destination airport.
ATC preferred routes - Preferred routes that are not
automatically applied by Host.
ATC requests - Used to prefix an ATC request when it
is relayed to an aircraft by other than an air traffic
controller.
ATC clears . attitude
displaced (for instance by flow over a hill) will tend to
return to its original level.
-
atom -The smallest particle of an element, consisting of
a positively charged nucleus orbited by one or more
negatively charged electrons.
atomic fission - The splitting of the nucleus of a heavy
atom such as uranium. This creates nuclei of two or
more lighter atoms releasing a tremendous amount of
energy in the form of heat and light.
atomic fusion - The combining of two nuclei of light
atoms to create a single nucleus of a heavy atom. This
releases a tremendous amount of energy in the form of
heat and light.
atomic number - The number of protons in the nucleus
of an atom. The atomic number of an element
determines the position of the element in the periodic
table of elements.
atomic weight - The average weight of a single atom in
a chemical element.
atomize - To reduce a liquid to a fine spray.
atomizing nozzle - A device that converts a liquid to a
fine spray.
ATCSCC delay factor - The amount of delay
calculated to be assigned
- .
prior to departure.
ATR racking system - A widely accepted size and
athodyd - Aero-thermodynamic duct. An open tube
mounting standard for airborne electronic equipment.
shaped to produce thrust when fuel is ignited - inside.
Fuel is added to incoming air as the athodyd moves ATS route - A specified route designated for
through the air at a high speed. This burning causes air channeling the flow of traffic as necessary for the
expansion that speeds up the air and produces thrust. provision of air traffic services. NOTE: The term
"ATS Route" is used to mean variously, airway,
athwartships - At right angles to the longitudinal axis
advisory route, controlled or uncontrolled route, arrival
of an aircraft.
or departure route, etc.
atmosphere - The envelope of gases that surrounds the
Earth.
atmospheric electricity - Any electrical phenomena in
the Earth's atmosphere, usually occurring between
clouds or between clouds and ground.
atmospheric moisture - The presence of H20 in any
one or all of the states: water vapor, water, or ice.
atmospheric noise - A noise (commonly referred to as
"static") on the radio. It is caused by the discharge of
atmospheric electricity between clouds or between
clouds and the ground.
attention - An element that helps your students gain
interest in the lesson.
attenuate - To diminish the intensity or strength of a
signal, for instance of a radar beam. In electronics, the
volume control changes (attenuates) the sound level
without changing any other characteristics of the
sound.
attenuation - 1. A reduction in the strength of a signal,
the flow of current, flux, or other energy in an
electronic system. 2. In radar meteorology, any process
which reduces intensity of radar signals.
atmospheric pressure - The pressure that is exerted on attenuator - A device in electronics that changes the
the surface of the earth by the air that surrounds the level of a signal's intensity without changing any other
earth. Within standard conditions, at sea level, the characteristics of the signal.
atmospheric pressure is 14.69 PSI.
attitude - 1. The position of an aircraft as determined by
atmospheric sounding - A measure of atmospheric the relationship of its axes and a reference, usually the
variables aloft, usually pressure, temperature, humidity earth's horizon. 2. A personal motivational
and wind.
predisposition to respond to persons, situations, or
events in a given manner that can, nevertheless, be
atmospheric stability - Describes a state in which an
changed or modified through training as a sort of
air parcel will resist vertical displacement, or once
mental shortcut to decision making.
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